ACID n.
One of a class of compounds, generally but not always distinguished by their sour taste, solubility in water, and reddening of vegetable blue or violet colors. They are also characterized by the power of destroying the distinctive properties of alkalies or bases, combining with them to form salts, at the same time losi…
AGE n.
A particular period of time in history, as distinguished from others; as, the golden age, the age of Pericles. "The spirit of the age." Prescott. Truth, in some age or other, will find her witness. Milton. Archeological ages are designated as three: The Stone age (the early and the later stone age, called paleolithic a…
ALKALI n.
One of a class of caustic bases, such as soda, potash, ammoma, and lithia, whose distinguishing peculiarities are solubility in alcohol and water, uniting with oils and fats to form soap, neutralizing and forming salts with acids, turning to brown several vegetable yellows, and changing reddened litmus to blue. Fixed a…
ALKALI SOIL n.
potash, and usually a little lime and magnesia. Two main classes of alkali are commonly distinguished: black alkali, which may be any alkaline carbonate, but which practically consists of sodium carbonate (sal soda), which is highly corrosive and destructive to vegetation; and white alkali, characterized by the prese…
ANTHROPOGRAPHY n.
which treats of the actual distribution of the human race in its different divisions, as distinguished by physical character, language, institutions, and customs, in contradistinction to ethnography, which treats historically of the origin and filiation of races and nations. P. Cyc.